Members of the student volunteer brigade for the protection of nature detain an intruder who drove into a protected area by car. Seminar for students of vigilantes on the exchange of practical experience in the detention of poachers. Meeting of the headquarters of the voluntary student brigade of Moscow State University; discussion of the problems associated with the preservation of the Meshchera lowland in its original form. Contaminated water in the river; a dead fish is swimming. Students sing a song. A student looks through binoculars; cranes are Flying.